Here's a video of my 3GS doing the same thing when I hold it with my whole hand instead of the usual fingertips that most people use.
http://www.youtube.com/watch?v=-t3AmWkZcE8
All cell phones do this.

The bad part about the first day is slow servers. If you catch it at the wrong time, it could tie your phone up for hours if the servers are slow- once you start you have to see it through to the end.
It is probably best to wait until the end of your day to start the process.